1, the most common one: the sun rises and sets in the west, which is enough to prove that the earth is a sphere.
2. Ships at sea level always see the mast first and then the hull from a distance, which can also prove that the earth is a sphere;
3. Standing high and seeing far can show that the ground plane is curved, and it can also show that the earth is a sphere;
When the partial eclipse occurred in the month, the earth blocked part of the sunlight, so that the earth's shadow was projected on the surface of the moon, just like looking at the earth in a mirror, so that we could see the globe, which also showed that the earth was a sphere.
Extended data:
Earth circle theory
Pythagoras, an ancient Greek mathematician in the sixth century BC, put forward the concept that the earth is a sphere. Aristotle summed up three scientific methods to prove that the earth is spherical: the farther north, the higher the Polaris; The farther south you go, the lower the Polaris, and you can see some new stars that you can't see in the north. These are all important achievements of human understanding of the earth, but they are only some mathematical inferences and theoretical arguments.
Until 15 19 ~ 1522, Portuguese Magellan's fleet completed the first round-the-world voyage in human history, and proved to all mankind that the earth was round with irrefutable facts.
Baidu Encyclopedia-Earth Circle Theory